Rainbow Electronics MAX861 - Manual (Page 3)

MAX860/MAX861
50mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Typical Operating Circuit (Inverter), V DD = +5V,
–
S
—
H
—
D
—
N
–
= V DD , FC = LV = GND, C1 = C2 = 10µF (Note 2), T A = T MIN to T MAX , unless
otherwise noted. Typical values are at T A = +25°C.)
Note 2: C1 and C2 are low-ESR (<0.2
Ω
) aluminum electrolytics. Capacitor ESR adds to the circuit’s output resistance. Using
capacitors with higher ESR may reduce output voltage and efficiency.
Note 3: Specified output resistance includes the effect of the 0.2
Ω
ESR of the test circuit’s capacitors.
Note 4: The switches are driven directly at the oscillator frequency, without any division.
Note 5: At lowest frequencies, using 10µF capacitors gives worse efficiency figures than using the recommended capacitor
values in Table 3, due to larger 1 ⁄ (f
s x C1) term in R OUT .
–
S
—
H
—
D
—
N
–
< 0.3V
MAX860
LV = GND
No load
MAX860/MAX861, FC = V DD ,
I L = 50mA to GND, C1 = C2 = 68µF
MAX860,
FC = V
DD
MAX861,
FC = V
DD
MAX861
FC < 4V
CONDITIONS
µA
10
Shutdown Supply Current
1
V
0.3 V IL
–
S
—
H
—
D
—
N
–
Threshold
1.2 V IH
% 99 99.9 Voltage-Conversion Efficiency
%
87
Power Efficiency (Note 5)
88 92
93 96
80 130
30 50
3 6
90 93
93 96
8 13
60 100
kHz
160 250
f S
Switching Frequency
(Note 4)
µA -2 -4 I FC FC Current (from V DD )
UNITS MIN TYP MAX SYMBOL PARAMETER
No load, V OUT = -4V µs 500 Time to Exit Shutdown
FC = V DD
FC = GND
FC = OUT
FC = V DD
FC = GND
FC = OUT
R L = 2k
Ω
from V DD
to OUT
R L = 1k
Ω
from OUT
to GND
R L = 2k Ω from V DD
to OUT
R L = 1k
Ω
from OUT
to GND
MAX86_I/E
MAX86_M